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    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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    <script>

        // 赋值运算符  =   +=  -=  *=  /=   %=

        var a = 1 ;
        var b = 2 ;


        // a = a + 2 ;
        // 简写 
        a += 2 ;
        document.write(a) ;

        console.log(a %= 3) ;  // a = a % 3 ;  a = 3 % 3 ; a = 0 ;

        var n = 345 ; // 输出百位十位个位

    </script>
    
</body>
</html>